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I am the brother he speaks of. I have a friend of mine who has been helping a great deal but everything we've tried. CCleaner, and trying to uninstall completely fail with Catastrophic failures. There is no EXISTENCE on the registry for this game and the exe still insists there is an instalation on a drive that doesn't exist.

The issue is the fact that the computer has a file somewhere that believes LoL has been installed on J drive and is in fact, a valid install instead of being run off of a flash drive.

An easy solution is as follows:
Back up the flash drive with LoL on it to a folder on a hard drive somewhere (This is your backup).
Plug the flash drive back into his computer.
Re-run the un-istallation procedure. Since you'll have the flash drive in, it should recognize that you have said copy of LoL up and running.
The uninstall will remove it from the flash drive and your computer, allowing you to install it normally to his hard drive somewhere.
Replace the files from the 'backup folder' onto your flash drive to retain a working flash drive copy.
Hope it works!